Figure 5: Interference based sensitivity.

(a), Spectra of the Type 1 in Cd²⁺ detection (grey to green: 0 μM, 50 μM, 100 μM and 200 μM). (b), Spectra of the Type 2 in DA detection (grey to green: 0 mM, 2 mM, 5 mM and 10 mM). (c), Spectra of the Type 3 in ssDNA detection (grey to green: 0 nM, 20 nM, 50 nM and 100 nM). (d–f), for Cd²⁺, DA and ssDNA, the correlation of concentration and spectral shift (red diamonds: Type 1, yellow boxes: Type 2, green triangles: Type 3). (g–i), for Cd²⁺, DA and ssDNA, the correlation of concentration and dip power alteration (red diamonds: Type 1, yellow boxes: Type 2, green triangles: Type 3). Here all the spectral shifts and dip alterations are plotted from 0.